Question: The point P(1, -1, -10) is on the surface z = -10((xy(. Starting at P, in what direction u = u1i + u2j should one

The point P(1, -1, -10) is on the surface z = -10((xy(. Starting at P, in what direction u = u1i + u2j should one move in each case?
(a) To climb most rapidly.
(b) To stay at the same level.
(c) To climb at slope 1.

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